<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 获取三个值  两个数字  一个操作符号
        let num1 = +prompt('请输入第一个数字');
        let num2 = +prompt('请输入第二个数字');
        let cz = prompt('请输入操作符+、-、*、/');
        // 再来把两个数字进行操作的结果 来展示
        switch (cz) {
            case '+':
                console.log(num1+num2);
                break;

            case '+':
                console.log(num1-num2);
                break

            case '*':
                console.log(num1*num2);
                break

            case '/':
                console.log(num1/num2);
                break

            default:
                break;
        }
    </script>
</body>
</html>